Improvement in machines for forming the hooks of machine-needles



N. PAINE. Machines for Forming the Hooks of Machine-Needles.

No, 142,863, Patented September16,1873.

J lnvemur *Per STATES UNITE NATHAN PAINE, OF MILFORD, MASSACHUSETTS.

IMPROVEMENT IN MACHINES FOR FORMING THE HOOKS 0F MACHINE-NEEDLES.

Specification forming part of Letters Patent No. 142,863, dated September 16, 1873; application filed August 4, 1873.

To all whom it may concern:

Be it known that I, NATHAN PAINE, of Milford, in the county of Worcester and State of Massachusetts, have invented a new and Improved Machine for Outtin g the Hooks of Machine-Needles, of which the following is a spec ification:

The object of this invention is the improvement in machines for making the hooks of needles used in machines for sewing or stitching leather; also to improve the quality of the work. The invention consists in the construction and combination of devices for performing the cutting operation, as hereinafter described and specifically indicated in the claims.

The prevailing fault of the machine-made needles now in use is a too-angular form of the inner side of the hook through which the thread passes, which impedes its passage and often 'chafes the thread and causes the breaking of the needle by the strain of the thread when obstructed by the edge of the hook. This machine obviates this defect by giving the needle a certain compound motion while the hook is being cut, by which the required curved form is secured instead of the angles, as heretofore.

In the accompanying drawing, Figure l is a side elevation of my improved machine. Fig. 2 is a plan view. Fig. 3 is a section of the cutter, and Fig. 4 is a section of the needle taken on the line 90 w of Fig. 3.

Similar letters of reference indicate corresponding parts.

Arepresents a stationary table, on which is a turn-table, B, arranged on a pivot, O, screwed firmly into the fixed table A, but a1- lowing said turn-table to swing freely from right to left, and vice versa. D is a beveled gear-wheel, immovably fixed upon the pin 0, independently of the turn-table. E is a stand firmly bolted to B, and supporting an arbor, F, on which at one end is a segmental gearwheel, G, in the center of which is a radial slot, I, in which is fixed the stock J of a clamp, H, which holds the needle L against the steel milling-cutter M, which is mounted on the arbor K, and driven by the pulley N. The needle is previously prepared for having the notch cutin another machine, which cuts two grooves extendinglengthwise on opposite sidesfromthe point backward to meet the notch to be cut by this machine. (See to, Figs. 3 and 4.) The mandrel K is suspended from a pivot, 0, near the end, having the cutter M, and the other end is capable of rising and falling, and provided with a cranked screw, P, to lift it, and a spring,

Q, to pull it down. The screw is used to throw the cutter down upon the needle when the latter is ready for the cutter to begin its work.

In order to understand the complex motion of the needle while being notched to form the hook, suppose the turn-tableB to be standing in the middle position-that is, with the arbor F in line or approximately so with the arbor K, and the slot I with the clamp H in a vertical position-the needle is then placed in the clamp with its side grooves at exactly to right and left. Now, if the turn-table is moved right or left to a right angle with the middle position the needle swings with it and turns on its own center one-fourth of a revolution, turning one side groove to directly up and the other directly down. Then, if the revolving cutter M be swung into the work it will enter the upper side groove, and when the turn-table is swung back to its middle position a notch will be formed to the center which will be an extension of the groove witha regularlycurved side. By continuing the movement of the turn-table to the opposite side the notch will be extended in like manner to the opposite groove a on the same regular curve.

In practice it is not required to'swing the turn-table quite to right angles with the middle position.

In practice the needle is adjusted in the clamp H, so that the part where the notch is to be cut is a little higher when the clamp stands in the middle position than the axis on which the needle turns, by which the cutter gradually cuts deeper into the needle during the first half of the operation-that is to say, until the needle comes back to the middle position, and it cuts gradually shallower during the other half, so as to make the notch deepest at the middle, as it is required to be.

The stock of the clamp is a little narrower than the groove in which it is secured to the wheel G, so as to be adjustable laterally, by

which the different sizes of needles can-be secured in the axis of the mandrel with a clamp having one stationary jaw and one movable one; otherwise the two j aws of the clamp would both have to be adjusted for needles of different sizes.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a needle-machine, the combination, with a milling-cutter, M, of the arbor F, mounted in bearings which revolve around pivot (J as a center, the gear-wheels D and Gr, and needle-clamp H,a11 operating as described, to give the needle the compound motion specifled.

' 2. In a needle-machine, the combination, with the arbor K suspended from the pivot O at the end carrying the cutter M, and having its bearings at the other end in a vertically-sliding block, of a screw, P, and spring Q, arranged as shown and described, to operate as specified.

3. The clamp-stock secured in a groove, I, a little wider than said stock, to allow of adjusting the clamp for needles of different sizes, substantially as specified. NATHAN PAINE.

Witnesses:

T. G. KENT, W. H. 0001:. 

